In choosing the kitesurfing school, the first thing to consider is if the school is accredited by the Professional Air Sports Association. Instructors must likewise be licensed by the International Kiteboarding Organization. This would assure you that they had the proper training necessary to become an instructor.
Another factor to consider is the price. Some schools cost more than others, so you must understand why they charge more. It could be that they cater to a few students at a time, so instructors can focus more on each student. Or it could be that equipment rental is already included in that fee. While it may cost a few more bucks than others, you nonetheless get more value for your money.
Consider also if you want to take a group class, or hire a private instructor. Hiring an instructor one-on-one may be more expensive, but you get more out of the lessons, and so you learn faster.
You may look into the track record of the different schools to help you choose. These schools have internet websites that you can visit and check. You can even send questions through email. Once you decide on the school, you may even do bookings online.
Kitesurfing schools in Brazil are among the best ones to learn from. But they can only do so much as to train you. If you want to be good at the sport, you need to practice on your own.
Any successful professional kitesurfer will tell you that hard work and determination are some qualities that you must have. More importantly, you must love the sport and enjoy it always.